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import sys
import maya.OpenMaya as OpenMaya
import maya.OpenMayaMPx as OpenMayaMPx

kPluginNodeName = "spGeomShader"
kPluginNodeClassify = "utility/color"
kPluginNodeId = OpenMaya.MTypeId(0x8700E)

class geomShader(OpenMayaMPx.MPxNode):
	def __init__(self):
		OpenMayaMPx.MPxNode.__init__(self)
		aOutColor = OpenMaya.MObject()
		aPoint = OpenMaya.MObject()
		aScale = OpenMaya.MObject()
		aOffset = OpenMaya.MObject()

	def compute(self, plug, block):
		if plug == geomShader.aOutColor or plug.parent() == geomShader.aOutColor:
			resultColor = OpenMaya.MFloatVector(0.0,0.0,0.0)
			
			point = block.inputValue( geomShader.aPoint ).asFloatVector()
			scale = block.inputValue( geomShader.aScale ).asFloatVector()
			offset = block.inputValue( geomShader.aOffset ).asFloatVector()

			resultColor.x = point.x * scale.x + offset.x
			resultColor.y = point.y * scale.y + offset.y
			resultColor.x = point.z * scale.z + offset.z

			outColorHandle = block.outputValue( geomShader.aOutColor )
			outColorHandle.setMFloatVector(resultColor)
			outColorHandle.setClean()
		else:
			return OpenMaya.kUnknownParameter


def nodeCreator():
	return OpenMayaMPx.asMPxPtr( geomShader() )

def nodeInitializer():
	nAttr = OpenMaya.MFnNumericAttribute()

	try:
		geomShader.aPoint = nAttr.createPoint("pointObj", "p")
		nAttr.setStorable(0)
		nAttr.setHidden(1)

		geomShader.aScale = nAttr.createPoint("scale", "s")
		nAttr.setKeyable(1) 
		nAttr.setStorable(1)
		nAttr.setReadable(1)
		nAttr.setWritable(1)
		nAttr.setDefault(1.0, 1.0, 1.0)

		geomShader.aOffset = nAttr.createPoint("offset", "o")
		nAttr.setKeyable(1) 
		nAttr.setStorable(1)
		nAttr.setReadable(1)
		nAttr.setWritable(1)

		geomShader.aOutColor = nAttr.createColor("outColor", "oc")
		nAttr.setStorable(0)
		nAttr.setHidden(0)
		nAttr.setReadable(1)
		nAttr.setWritable(0)

	except:
		sys.stderr.write("Failed to create attributes\n")
		raise

	try:
		geomShader.addAttribute(geomShader.aPoint)
		geomShader.addAttribute(geomShader.aScale)
		geomShader.addAttribute(geomShader.aOffset)
		geomShader.addAttribute(geomShader.aOutColor)
	except:
		sys.stderr.write("Failed to add attributes\n")
		raise

	try:
		geomShader.attributeAffects (geomShader.aPoint, geomShader.aOutColor)
		geomShader.attributeAffects (geomShader.aScale, geomShader.aOutColor)
		geomShader.attributeAffects (geomShader.aOffset, geomShader.aOutColor)
	except:
		sys.stderr.write("Failed in setting attributeAffects\n")
		raise


# initialize the script plug-in
def initializePlugin(mobject):
	mplugin = OpenMayaMPx.MFnPlugin(mobject)
	try:
		mplugin.registerNode( kPluginNodeName, kPluginNodeId, nodeCreator, 
					nodeInitializer, OpenMayaMPx.MPxNode.kDependNode, kPluginNodeClassify )
	except:
		sys.stderr.write( "Failed to register node: %s" % kPluginNodeName )
		raise

# uninitialize the script plug-in
def uninitializePlugin(mobject):
	mplugin = OpenMayaMPx.MFnPlugin(mobject)
	try:
		mplugin.deregisterNode( kPluginNodeId )
	except:
		sys.stderr.write( "Failed to deregister node: %s" % kPluginNodeName )
		raise
	
